Rewritable optical information medium

Details Rewritable optical information medium Rewritable optical information medium

1998-11-02

2000-10-03

Evans, Elizabeth

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428 642, 428 644, 428 645, 428 646, 428913, 43027013, 4304951, 430945, 369283, 369288, B32B 300

Patent

active

061270490

ABSTRACT:
A rewritable optical information medium has a phase-change recording layer on the basis of an alloy of Ge--Sb--Te, which composition is situated within the pentagonal area PQRST in a triangular ternary composition diagram. These alloys show a complete erase time of 50 ns or less. CET-values below 45 ns are obtained with alloys situated on the tie-line connecting Te and the compound GeSb.sub.2 Te.sub.4 within the area PQRST. Such a medium is suitable for high speed recording (i.e. at least six times the CD-speed), such as for DVD-RAM and optical tape.

REFERENCES:
patent: 5191565 (1993-03-01), Inoue et al.
patent: 5965229 (1999-10-01), Zhou

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